warning signal
71Ballistic Missile Early Warning System — The United States Air Force Ballistic Missile Early Warning System (BMEWS) was the first operational ballistic missile detection radar. The original system was built in 1959 and could provide long range warning of a ballistic missile attack over… …
72Automatic Warning System — Le sunflower. L’Automatic Warning System (AWS) est un système de répétition des signaux en cabine utilisé au Royaume Uni (à partir de 1956) à Hong Kong et en Australie (Queensland et …
73Federal Signal Corporation — Infobox Company company name = Federal Signal Corporation company company type = Public (NYSE: [http://www.nyse.com/about/listed/lcddata.html?ticker=FSS FSS] ) foundation = 1901 location = flagicon|Illinois Oak Brook, Illinois, USA key people =… …
74Four-minute warning — For the song by Mark Owen, see Four Minute Warning (song). The four minute warning was a public alert system conceived by the British Government during the Cold War and operated between 1953 and 1992 when the system was dismantled after the cold… …
75Airborne Early Warning and Control — An Airborne Early Warning (AEW) system is a radar system carried by an aircraft which is designed to detect other aircraft. Used at a high altitude, the radars allow the operators to distinguish between friendly and hostile aircraft hundreds of… …
76Alarm signal — In the field of animal communication, an alarm signal is an antipredator adaptation referring to various signals emitted by social animals in response to danger. Many primates and birds have elaborate alarm calls for warning conspecifics of… …
77fog signal — any of various types of signal used as a warning by vessels navigating in fog or mist. [1750 60] * * * fog signal noun A detonating cap or other audible warning used in fog • • • Main Entry: ↑fog * * * fog signal, a bell, siren, horn, or other… …
78Railway semaphore signal — One of the earliest forms of fixed railway signal is the semaphore. These signals display their different indications to train drivers by changing the angle of inclination of a pivoted arm . Semaphore signals were patented in the early 1840s by… …
79Airborne early warning and control — AEW redirects here. For other uses, see AEW (disambiguation). For the airline, see Air Wisconsin. United States Air Force E 3 Sentry …
80Coastal warning display tower — A coastal warning display tower, sometimes known as a storm warning tower, was a special kind of skeletal tower designed to provide hurricane warnings. The towers were developed in 1898 on the orders of President William McKinley. Warning pennant …
